Customer demands are constantly changing. There are many reasons for this, ranging from fashions to new regulations. Sometimes there are obvious patterns to demand. Another pattern comes from the product’s life cycle. Demand for just about every product follows a life cycle with five stages:

Introduction. A new product appears and demand is low while people learn about it, try it and see if they like it—for example, palmtop computers and automated checkouts at supermarkets.

Withdrawal. Demand declines to the point where it is no longer worth making the product—for example, black and white television sets and telegrams.

The length of the life cycle varies quite widely. Each edition of The Guardian completes its life cycle in a few hours; clothing fashions last months or even weeks; the life cycle of washing machines is several years; some basic commodities like Nescafe has stayed in the mature stage for decades.

Unfortunately, there are no reliable guidelines for the length of a cycle. Some products have an unexpectedly short life and disappear very quickly. Some products, like full cream milk stayed at the mature stage for years and then started to decline. Even similar products can have different life cycles – with Ford replacing small car models after 12 years and Honda replacing them after seven years. Some products appear to decline and then grow again—such as passenger train services which grew by 7 per cent in 1998 and cinemas where attendances fell from 1.64 billion in 1964 to 54 million in 1984, and then rose to 140 million in 1997.

One thing we can say is that product life cycles are generally getting shorter. Alvin Toffler says, ‘Fast-shifting preferences, flowing out of and interacting with high-speed technological change, not only lead to frequent changes in the popularity of products and brands, but also shorten the life-cycle of products.’

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